Fortnight in pictures: (September 17 – October 7)

Satoshi Omura, professor at Kitasato University, reacts as he attends a news conference in Tokyo on October 5, 2015. Three scientists from Japan, China and Ireland whose discoveries led to the development of potent new drugs against parasitic diseases such as malaria and elephantiasis were awarded this year’s Nobel Prize for Medicine. Irish-born William Campbell and Japan's Omura won half of the prize for discovering avermectin, a derivative of which has been used to treat millions of people with river blindness and lymphatic filariasis, or elephantiasis